EP1555091B1 - Driver drill - Google Patents
Driver drill Download PDFInfo
- Publication number
- EP1555091B1 EP1555091B1 EP04027017A EP04027017A EP1555091B1 EP 1555091 B1 EP1555091 B1 EP 1555091B1 EP 04027017 A EP04027017 A EP 04027017A EP 04027017 A EP04027017 A EP 04027017A EP 1555091 B1 EP1555091 B1 EP 1555091B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mode
- spindle
- intermediate member
- percussion
- cam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009527 percussion Methods 0.000 claims description 44
- 230000002452 interceptive effect Effects 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/008—Gear boxes, clutches, bearings, feeding mechanisms or like equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/141—Mechanical overload release couplings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D16/006—Mode changers; Mechanisms connected thereto
Definitions
- the present invention relates to a driver drill usable with a selection of a clutch mode and a drill mode.
- a clutch mode is achieved in a planetary gear reduction mechanism disposed between a motor and a spindle with a structure in which one of internal gears interlocked with the circumference of planetary gears can be rotated within a housing.
- the internal gear is pressed and locked by a coil spring through steel balls held by a gear case accommodating the planetary gear reduction mechanism and engaged with an end face of the internal gear and through a washer externally provided to the gear case so as to abut on the steel balls. That is, when a load on the spindle is increased to exceed a biasing force of the coil spring, the internal gear idles to interrupt the transfer of rotation to the spindle.
- a drill mode is achieved by a locking means that makes a spring holder for holding the coil spring or another pressing member directly abut on the washer disposed between the steel ball and the coil spring by rotative operation of an operating member, such as a change ring, thereby regulating the movement of the washer.
- an operating member such as a change ring
- the clutch mechanism disclosed in the above patent document is designed to regulate the movement of the washer externally provided to the housing by using a cap, which is a member separated from the housing. Therefore, even with the clutch mechanism, an influence of the tolerances of the housing and the cap cannot be eliminated. After all, the possibility of the occurrence of erroneous operation of the clutch in the drill mode cannot be prevented.
- US 6, 142,242 discloses a percussion driver drill which can be switched between a drill mode and a clutch mode. For this purpose a pair of projections provided on a first change ring are moved in conjunction with the rotation of the first change ring, such that stoppers move back and forth in axial direction. During the percussion mode and drill mode these stoppers abut against a flat washer, such that the forward movement of the flat washer is restricted.
- an object of the present invention according to a first aspect is to provide a driver drill that can effectively prevent erroneous clutch operation in a drill mode and can achieve excellent reliability.
- a locking means for regulating the movement of an intermediate member serves as an interfering unit provided with a gear case to interfere with the intermediate member at a predetermined rotating position of the intermediate member to regulate the movement, and the rotative operation of the operating member enables the intermediate member to rotate to a lock position where interference occurs with the interfering unit and to a lock-releasing position where no interference occurs with the same, thereby allowing the clutch mode and the drill mode to be selected.
- the driver drill further includes a cam means that can add percussion operation to an axial direction in conjunction with the spindle.
- the operating member has a third rotating position other than rotating positions in the clutch mode and the drill mode, where the cam means is in conjunction with the spindle and the intermediate member interferes with the interfering unit. Then, by rotative operation of the operating member, a percussion mode in which percussion is transferred to the spindle can be further selected.
- the driver drill in order to reliably perform torque adjustment and switching the operation mode in the clutch mode, further includes a second operating member capable of adjusting a pressing force of the pressing means by rotative operation.
- the movement of the intermediate member is regulated by the interfering unit provided with the gear case which holds the intermediate member. Due to this, the intermediate member is securely locked without being influenced by tolerances among the components. Therefore, erroneous clutch operation in a drill mode can be effectively prevented, and excellent reliability can be achieved.
- any one of three operation modes that is, the clutch mode, drill mode, and the percussion mode, can be selected only by rotative operation of the operating member. Therefore, outstanding usability can be achieved.
- torque adjustment in the clutch mode is performed by the second operating means, which is provided separately from the operating member. Therefore, switching of the operation mode can be performed irrespective of the position where torque adjustment is performed by the second operating member. Furthermore, the operation mode is prevented from being erroneously switched at the time of torque adjustment.
- Fig. 1 is a perspective view of a percussion driver drill, which is an example of a driver drill
- Fig. 2 is a vertical section view of the percussion driver drill.
- a percussion driver drill 1 has a motor 3 accommodated in a body housing 2 formed of a pair of right and left half-housings. From an output shaft 4 of the motor 3, rotation is transferred to a spindle 5 through a gear assembly 7 mounted at the front side (at the right in Figs. 1 and 2 ) in the body housing 2 and from which the spindle 5 protrudes forward.
- a drill chuck 6 whose tip can hold a bit is provided.
- the reference number 8 denotes a switch for driving the motor 3
- the reference number 9 denotes a handle.
- the reference number 10 denotes a battery pack as a power source mounted at the lower end of the handle 9.
- the gear assembly 7 includes a first gear case 11 and a second gear case 12 mounted at the front of the first gear case 11.
- the second gear case 12 has a two-step cylindrical shape with a large-diameter unit 13 and a small-diameter unit 14.
- a known planetary gear reduction mechanism is accommodated inside the first gear case 11 and the large-diameter unit 13.
- a plurality of planetary gears 15, 15..., carriers 16, 16... supporting the same and internal gears 17, 17... interlocked with the outer circumference of the planetary gears 15, 15... are disposed in three layers.
- the spindle 5 is spline-connected at its rear end to a lock cam 18 which is integrally formed with the carrier 16 of the third layer.
- the spindle 5 is also axially supported by ball bearings 19 and 20 in the small-diameter unit 14 of the second gear case 12. Therefore, the spindle 5 receives the reduced speed of rotation of the output shaft 4, and also can move back and forth in an axial direction.
- the spindle 5 In a normal state, the spindle 5 is pressed toward a forward position where a first cam 26 (which will be described below) abuts on the ball bearing 20.
- the spindle is pressed by a flange 21 formed at the front side and a coil spring 22 externally mounted between the flange 21 and the ball bearing 20.
- the reference numbers 23 and 24 denote cylindrical spacers, inserted from the front side to the inner circumference of the small-diameter unit 14 for clipping and positioning the ball bearing 20.
- the reference number 25 denotes a disk-shaped stopper plate screwed to the front end of the small-diameter unit 14 for preventing the spacer 24 from coming off.
- a first cam 26 and a second cam 27 each having a ring shape are externally and coaxially mounted from the front side.
- the first cam 26 has first cam gears 28, 28... on its rear surface, radially and continuously formed in a circumferential direction.
- the first cam is also integrally fixed to the spindle 5 inside the spacer 23.
- the second cam 27 has second cam gears 29, 29... each having the same shape as the first cam gears 28, 28... on its front surface facing to the first cam gears 28, 28....
- the second cam 27 has a spline portion 30 on its outer circumference of its rear surface.
- the second cam 27 is slipped onto the spindle 5 with play, so that it can move back and forth in a rotational and axial direction.
- the second cam 27 can only slightly move until a position where the second cam 27 is interlocked with the first cam 26.
- the second cam 27 is regulated by a stopper 31 protruding toward the inner circumference of the small-diameter unit 14, and can slightly move until a position where the second cam 27 abuts on a pair of washers 33 holding a plurality of steel balls 32, 32....
- the small-diameter unit 14 is formed with guide grooves 34, 34... extending from its front end along the axial direction to be symmetrical to the point.
- a coil spring 35 and a percussion switching lever 36 are slidably provided in each of the guide grooves 34.
- an inner protrusion 37 is provided protruding toward the inner circumference of the small-diameter unit 14 so as to be interlockable with the spline portion 30 of the second cam 27 at a forward position.
- an outer protrusion 38 is provided protruding toward the outer circumference of the small-diameter unit 14.
- a mode-change ring 39 as an operating member is rotatably mounted between the front end of the body housing 2 and the stopper plate 25.
- the mode-change ring 39 includes an operation ring 40, a cam ring 41 and three connecting plates 42, 42.... While the operation ring 40 has a diameter approximately equal to that of the front end of the body housing 2, the cam ring 41 has a diameter smaller than that of the operation ring 40 and is positioned at the front thereof.
- the three connecting plates 42, 42... extend from the outer circumference of the cam ring 41 in the axial direction and are uniformly spaced apart in a circumferential direction for connecting both the rings 40 and 41.
- the cam ring 41 of this mode-change ring 39 abuts on the outer protrusion 38 of the percussion switching lever 36 at its rear-end edge.
- This configuration makes it possible to regulate the forward position of the percussion switching lever 36 pressed forward by the coil spring 35.
- a pair of cam concave portions 43, 43 are provided, each having a trapezoidal shape and being symmetrical to the point, at the rear-end edge of the cam ring 41.
- the percussion switching lever 36 goes backward to allow the inner protrusion 37 to be disengaged from the spline portion 30 of the second cam 27.
- the reference number 44 denotes a cylindrical change ring as a second operating member externally and rotatably mounted around the mode-change ring 39 between the front side of the operation ring 40 and the stopper plate 25.
- An internal screw portion 45 is provided in the inner circumference of the change ring 44.
- a spring holder 46 is provided so as to move in the axial direction.
- an external screw portion 47 protrudes from the connecting plates 42, 42... of the mode-change ring 39 to be screwed into the internal screw portion 45 of the change ring 44. Therefore, when the mode-change ring 39 is rotated, the spring holder 46 is screwed toward in the axial direction.
- a flat washer 48 is provided as an intermediate member.
- the flat washer 48 has three external projections 49, 49... protruding from an edge of the outer circumference of the small-diameter unit 14 and uniformly spaced apart in a circumferential direction, and also has four internal projections 50, 50... protruding from an edge of the inner circumference thereof and forming two pairs with bilateral symmetry.
- the external projections 49, 49... fit in concave grooves 51, 51...
- protruding streaks 52, 52... as interfering units are provided along the axial direction on the outer circumference of the small-diameter unit 14.
- the protruding streaks 52, 52... are formed on a front side of the small-diameter 14 having a distance of the approximate thickness of the flat washer 48 from the front surface of the large-diameter unit 13. A part of the protruding streaks 52, 52...
- the flat washer 48 can rotate at the bottom of the small-diameter unit 14 where the protruding streaks 52 are not provided (at a backward position, which will be described further below).
- the flat washer 48 can move forward from that bottom only at a coinciding position (a lock-releasing position) shown in Fig. 6 where the internal projections 50 do not interfere with the protruding streaks 52 in the axial direction.
- a coil spring 53 serving as a pressing means is externally mounted around the small-diameter unit 14 to press the flat washer 48 toward the large-diameter unit 13.
- sets of two steel balls 54, 54... aligned back and forth are provided as engaging members.
- the steel balls 54, 54... are uniformly spaced apart and held in the circumferential direction. With this configuration, the steel balls 54, 54... can abut on the front surface of the internal gear 17 rotatably provided to the third layer of the planetary gear reduction mechanism, and can be engaged in the circumferential direction with clutch cams 55, 55....
- the flat washer 48 has a trapezoidal shape, and it protrudes from the front surface of the internal gear 17 to the circumferential direction and are uniformly spaced apart.
- a biasing force of the coil spring 53 is directly transferred to the internal gear 17. Therefore, rotation of the internal gear 17 is regulated by the biasing force of the coil spring 53.
- the spring holder 46 is screwed in accordance with the rotative operation of the change ring 44, the length of the coil spring 53 in the axial direction is changed, thereby allowing the biasing force to the internal gear 17 to be changed.
- the flat washer 48 is at the backward position which is close to, but does not allow the flat washer 48 to make contact with, the front surface of the large-diameter unit 13.
- any one of three operation modes can be selected based on the rotating position of the mode-change ring 39 accompanied by back-and-forth movement of the percussion switching lever 36 and the rotation of the flat washer 48.
- the spindle 5 When the spindle 5 is rotated in this percussion mode, the spindle 5 is moved backward by pressing the drill bit or the like onto a material to be processed. Then, the first cam 26 rotating integrally with the spindle 5 interlocks with the second cam 27 which is locked by the percussion switching lever 36, whereby percussion occurs to the spindle 5.
- the flat washer 48 is still locked by the protruding streaks 52, the spindle 5 continues to rotate irrespective of the load on the spindle 5.
- a leaf spring 56 is fixed to the inner circumference at the front end of the body housing 2.
- three concave portions 57, 57... are provided around the outer circumference at the rear end of the operation ring 40 in the mode-change ring 39.
- the leaf spring 56 is engaged with each of the concave portions 57 at a rotating position corresponding to the relevant mode. In this way, click operation can be achieved for positioning the mode-change ring 39 in the relevant mode.
- the protruding streaks 52 serve as the locking means for locking the flat washer 48.
- the protruding streaks are provided on the small-diameter unit 14 of the second gear case 12 to interfere with the flat washer 48 at a predetermined rotating position of the same to regulate its movement.
- the flat washer 48 is rotated to a lock position where interference occurs with the protruding streaks 52 and to a lock-releasing position where interference does not occur with the protruding streaks 52.
- This allows either the clutch mode or the drill mode to be selected. Therefore, the flat washer 48 can be securely locked without being influenced by tolerances among the components. Due to this, erroneous clutch operation in the drill mode can be effectively prevented, and high reliability can be achieved.
- the mode-change ring 39 has a third rotating position other than rotating positions in the clutch mode and the drill mode, where the second cam 27 is locked by the percussion switching lever 36 and the front washer 48 interferes with the protruding streaks 52.
- the percussion mode can be selected for the spindle 5. Therefore, any one of three operation modes, that is, the clutch mode, drill mode, and the percussion mode, can be selected only with the rotative operation of the mode-change ring 39, whereby outstanding usability is achieved.
- the change ring 44 is provided for torque adjustment in the clutch mode, separately from the mode-change ring 39. Therefore, switching of the operation mode can be performed irrespective of the position where torque adjustment is performed by the change ring 44. Still further, the operation mode is prevented from being erroneously switched at the time of torque adjustment.
- the protruding streaks are provided with the small-diameter unit in the axial direction of the second gear case in order to regulate the movement of the flat washer.
- another interfering unit such as protruding streaks or pin-shaped protrusions provided in a circumferential direction, can regulate the movement of the flat washer.
- the intermediate member is not restricted to the flat washer, but may be a cylindrical body.
- the engaging members are not restricted to the steel balls, and pins with their end being shaped like a cylinder or circle can be adopted.
- the above embodiment is described with a percussion driver drill in which a percussion mode is selectable.
- a locking means similar to that in the above embodiment can be adopted for a driver drill not having a cam means and a percussion mode.
- the present invention can be applied to even a driver drill or a percussion driver drill in which operation-mode selection and torque adjustment can be performed only with a single operating member.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Percussive Tools And Related Accessories (AREA)
- Portable Power Tools In General (AREA)
- Retarders (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Description
- The present invention relates to a driver drill usable with a selection of a clutch mode and a drill mode.
- In a driver drill, firstly, a clutch mode is achieved in a planetary gear reduction mechanism disposed between a motor and a spindle with a structure in which one of internal gears interlocked with the circumference of planetary gears can be rotated within a housing. Also, the internal gear is pressed and locked by a coil spring through steel balls held by a gear case accommodating the planetary gear reduction mechanism and engaged with an end face of the internal gear and through a washer externally provided to the gear case so as to abut on the steel balls. That is, when a load on the spindle is increased to exceed a biasing force of the coil spring, the internal gear idles to interrupt the transfer of rotation to the spindle.
- Conversely, a drill mode is achieved by a locking means that makes a spring holder for holding the coil spring or another pressing member directly abut on the washer disposed between the steel ball and the coil spring by rotative operation of an operating member, such as a change ring, thereby regulating the movement of the washer. However, as tolerances of the components, such as the washer and the pressing member, is increasingly accumulated, the washer might move to operate the clutch even in the drill mode. To solve this problem, in a clutch mechanism disclosed in
Japan Published Unexamined Patent Application No. 9-79292 - However, the clutch mechanism disclosed in the above patent document is designed to regulate the movement of the washer externally provided to the housing by using a cap, which is a member separated from the housing. Therefore, even with the clutch mechanism, an influence of the tolerances of the housing and the cap cannot be eliminated. After all, the possibility of the occurrence of erroneous operation of the clutch in the drill mode cannot be prevented.
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US 6, 142,242 discloses a percussion driver drill which can be switched between a drill mode and a clutch mode. For this purpose a pair of projections provided on a first change ring are moved in conjunction with the rotation of the first change ring, such that stoppers move back and forth in axial direction. During the percussion mode and drill mode these stoppers abut against a flat washer, such that the forward movement of the flat washer is restricted. - Therefore, an object of the present invention according to a first aspect is to provide a driver drill that can effectively prevent erroneous clutch operation in a drill mode and can achieve excellent reliability.
- To achieve the object mentioned above a driver drill according to claim 1 is proposed. According to the present invention, a locking means for regulating the movement of an intermediate member, such as a washer, serves as an interfering unit provided with a gear case to interfere with the intermediate member at a predetermined rotating position of the intermediate member to regulate the movement, and the rotative operation of the operating member enables the intermediate member to rotate to a lock position where interference occurs with the interfering unit and to a lock-releasing position where no interference occurs with the same, thereby allowing the clutch mode and the drill mode to be selected.
- In a first preferred embodiment of the present invention according to
claim 2, the driver drill further includes a cam means that can add percussion operation to an axial direction in conjunction with the spindle. In order to achieve excellent operability associated with selection of the operation mode, the operating member has a third rotating position other than rotating positions in the clutch mode and the drill mode, where the cam means is in conjunction with the spindle and the intermediate member interferes with the interfering unit. Then, by rotative operation of the operating member, a percussion mode in which percussion is transferred to the spindle can be further selected. - In a further preferred embodiment of the present invention according to
claim 3 based on eitherclaim 1 or 2, in order to reliably perform torque adjustment and switching the operation mode in the clutch mode, the driver drill further includes a second operating member capable of adjusting a pressing force of the pressing means by rotative operation. - According to the present invention, the movement of the intermediate member is regulated by the interfering unit provided with the gear case which holds the intermediate member. Due to this, the intermediate member is securely locked without being influenced by tolerances among the components.
Therefore, erroneous clutch operation in a drill mode can be effectively prevented, and excellent reliability can be achieved. - According to the first preferred embodiment of the present invention, any one of three operation modes, that is, the clutch mode, drill mode, and the percussion mode, can be selected only by rotative operation of the operating member. Therefore, outstanding usability can be achieved.
- According to the further preferred embodiment of the present invention, torque adjustment in the clutch mode is performed by the second operating means, which is provided separately from the operating member. Therefore, switching of the operation mode can be performed irrespective of the position where torque adjustment is performed by the second operating member. Furthermore, the operation mode is prevented from being erroneously switched at the time of torque adjustment.
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Fig. 1 is a perspective view of a percussion driver drill. -
Fig. 2 is a vertical section view of the percussion driver drill. -
Fig. 3 is an exploded perspective view of a gear assembly. -
Figs. 4A and 4B are vertical section views of the gear assembly in a clutch mode. -
Fig. 4C is a section view taken along line A-A shown inFig. 4B . -
Fig. 5A shows a side view and a section view taken along line B-B of a second gear case. -
Fig. 5B is an illustration for describing a flat washer. -
Fig. 5C is an illustration for describing a mode-change ring. -
Fig. 6 shows a side view and a section view taken along line C-C of the second gear case with the mode-change ring attached thereto. -
Figs. 7A and 7B are vertical section views of the gear assembly in a drill mode. -
Fig. 7C is a section view taken along line D-D shown inFig. 7B . -
Figs. 8A and 8B are vertical section views of the gear assembly in a percussion mode. -
Fig. 8C is a section view taken along line E-E shown inFig. 8B . - An embodiment according to the present invention is described below based on the drawings.
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Fig. 1 is a perspective view of a percussion driver drill, which is an example of a driver drill, andFig. 2 is a vertical section view of the percussion driver drill. A percussion driver drill 1 has amotor 3 accommodated in abody housing 2 formed of a pair of right and left half-housings. From anoutput shaft 4 of themotor 3, rotation is transferred to aspindle 5 through agear assembly 7 mounted at the front side (at the right inFigs. 1 and2 ) in thebody housing 2 and from which thespindle 5 protrudes forward. At the front end of thespindle 5, adrill chuck 6 whose tip can hold a bit is provided. Thereference number 8 denotes a switch for driving themotor 3, and thereference number 9 denotes a handle. Moreover, thereference number 10 denotes a battery pack as a power source mounted at the lower end of thehandle 9. - As shown in
Figs. 3 and4 , thegear assembly 7 includes afirst gear case 11 and asecond gear case 12 mounted at the front of thefirst gear case 11. As shown inFig. 5A , thesecond gear case 12 has a two-step cylindrical shape with a large-diameter unit 13 and a small-diameter unit 14. A known planetary gear reduction mechanism is accommodated inside thefirst gear case 11 and the large-diameter unit 13. In the planetary gear reduction mechanism, a plurality ofplanetary gears carriers internal gears planetary gears spindle 5 is spline-connected at its rear end to alock cam 18 which is integrally formed with thecarrier 16 of the third layer. Thespindle 5 is also axially supported byball bearings diameter unit 14 of thesecond gear case 12. Therefore, thespindle 5 receives the reduced speed of rotation of theoutput shaft 4, and also can move back and forth in an axial direction. - In a normal state, the
spindle 5 is pressed toward a forward position where a first cam 26 (which will be described below) abuts on theball bearing 20. The spindle is pressed by aflange 21 formed at the front side and acoil spring 22 externally mounted between theflange 21 and theball bearing 20. Thereference numbers diameter unit 14 for clipping and positioning theball bearing 20. Thereference number 25 denotes a disk-shaped stopper plate screwed to the front end of the small-diameter unit 14 for preventing thespacer 24 from coming off. - Also, between the
ball bearings spindle 5, afirst cam 26 and asecond cam 27 each having a ring shape are externally and coaxially mounted from the front side. Thefirst cam 26 has first cam gears 28, 28... on its rear surface, radially and continuously formed in a circumferential direction. The first cam is also integrally fixed to thespindle 5 inside thespacer 23. Thesecond cam 27 has second cam gears 29, 29... each having the same shape as the first cam gears 28, 28... on its front surface facing to the first cam gears 28, 28.... Moreover, thesecond cam 27 has aspline portion 30 on its outer circumference of its rear surface. Thesecond cam 27 is slipped onto thespindle 5 with play, so that it can move back and forth in a rotational and axial direction. In a forward direction, thesecond cam 27 can only slightly move until a position where thesecond cam 27 is interlocked with thefirst cam 26. In a backward direction, thesecond cam 27 is regulated by astopper 31 protruding toward the inner circumference of the small-diameter unit 14, and can slightly move until a position where thesecond cam 27 abuts on a pair ofwashers 33 holding a plurality ofsteel balls - Furthermore, the small-
diameter unit 14 is formed withguide grooves guide grooves 34, acoil spring 35 and apercussion switching lever 36 are slidably provided. On an inner surface of the rear end of eachpercussion switching lever 36, aninner protrusion 37 is provided protruding toward the inner circumference of the small-diameter unit 14 so as to be interlockable with thespline portion 30 of thesecond cam 27 at a forward position. Also, on an outer surface of the front end of eachpercussion switching lever 36, anouter protrusion 38 is provided protruding toward the outer circumference of the small-diameter unit 14. - Moreover, around the small-
diameter unit 14, a mode-change ring 39 as an operating member is rotatably mounted between the front end of thebody housing 2 and thestopper plate 25. The mode-change ring 39 includes anoperation ring 40, acam ring 41 and three connectingplates operation ring 40 has a diameter approximately equal to that of the front end of thebody housing 2, thecam ring 41 has a diameter smaller than that of theoperation ring 40 and is positioned at the front thereof. The three connectingplates cam ring 41 in the axial direction and are uniformly spaced apart in a circumferential direction for connecting both therings cam ring 41 of this mode-change ring 39 abuts on theouter protrusion 38 of thepercussion switching lever 36 at its rear-end edge. This configuration makes it possible to regulate the forward position of thepercussion switching lever 36 pressed forward by thecoil spring 35. Also, a pair of camconcave portions cam ring 41. When the mode-change ring 39 is at a rotating position where the camconcave portions 43 are positioned in front of theouter protrusion 38, thepercussion switching lever 36 goes forward to allow theinner protrusion 37 to be engaged with thespline portion 30 of thesecond cam 27. Furthermore, when the mode-change ring 39 is at a rotating position where the camconcave portions 43 are not positioned in front of theouter protrusion 38, thepercussion switching lever 36 goes backward to allow theinner protrusion 37 to be disengaged from thespline portion 30 of thesecond cam 27. - The
reference number 44 denotes a cylindrical change ring as a second operating member externally and rotatably mounted around the mode-change ring 39 between the front side of theoperation ring 40 and thestopper plate 25. Aninternal screw portion 45 is provided in the inner circumference of thechange ring 44. Around the small-diameter unit 14, aspring holder 46 is provided so as to move in the axial direction. In thespring holder 46, anexternal screw portion 47 protrudes from the connectingplates change ring 39 to be screwed into theinternal screw portion 45 of thechange ring 44. Therefore, when the mode-change ring 39 is rotated, thespring holder 46 is screwed toward in the axial direction. - On the other hand, as shown in
Fig. 5B , around the bottom of the small-diameter unit 14, aflat washer 48 is provided as an intermediate member. Theflat washer 48 has threeexternal projections diameter unit 14 and uniformly spaced apart in a circumferential direction, and also has fourinternal projections Fig. 5C andFig. 6 , theexternal projections concave grooves operation ring 40 of the mode-change ring 39, and are rotatable integrally with the mode-change ring 39 and movable separately in the axial direction. As shown inFig. 5A , protrudingstreaks diameter unit 14. The protrudingstreaks diameter 14 having a distance of the approximate thickness of theflat washer 48 from the front surface of the large-diameter unit 13. A part of the protrudingstreaks flat washer 48 and the remaining part of the same rides on theinternal projections flat washer 48 can rotate at the bottom of the small-diameter unit 14 where the protrudingstreaks 52 are not provided (at a backward position, which will be described further below). On the other hand, theflat washer 48 can move forward from that bottom only at a coinciding position (a lock-releasing position) shown inFig. 6 where theinternal projections 50 do not interfere with the protrudingstreaks 52 in the axial direction. - Between the
flat washer 48 and thespring holder 46, acoil spring 53 serving as a pressing means is externally mounted around the small-diameter unit 14 to press theflat washer 48 toward the large-diameter unit 13. Inside the large-diameter unit 13 at the rear of theflat washer 48, sets of twosteel balls steel balls steel balls internal gear 17 rotatably provided to the third layer of the planetary gear reduction mechanism, and can be engaged in the circumferential direction withclutch cams clutch cams internal gear 17 to the circumferential direction and are uniformly spaced apart. Through thesesteel balls flat washer 48, a biasing force of thecoil spring 53 is directly transferred to theinternal gear 17. Therefore, rotation of theinternal gear 17 is regulated by the biasing force of thecoil spring 53. Also, as thespring holder 46 is screwed in accordance with the rotative operation of thechange ring 44, the length of thecoil spring 53 in the axial direction is changed, thereby allowing the biasing force to theinternal gear 17 to be changed. Here, in this pressing state, theflat washer 48 is at the backward position which is close to, but does not allow theflat washer 48 to make contact with, the front surface of the large-diameter unit 13. - In the above-structured percussion driver drill 1, as will be described in the following, any one of three operation modes can be selected based on the rotating position of the mode-
change ring 39 accompanied by back-and-forth movement of thepercussion switching lever 36 and the rotation of theflat washer 48. - Firstly, as shown in
Fig 4C , in a first rotating position of the mode-change ring 39 at which theinternal projections 50 of theflat washer 48 do not interfere with the protrudingstreaks 52 of the small-diameter unit 14 in the axial direction, the camconcave portions 43 of thecam ring 41 are positioned away from the front of thepercussion switching lever 36. Therefore, as shown inFig. 4A , thepercussion switching lever 36 is at a backward position, and thus theinner protrusion 37 and thesecond cam 27 are not connected to each other. Accordingly, in a condition that thesecond cam 27 is freely rotatable and that theflat washer 48 is movable forward, rotative operation of thechange ring 44 leads to a clutch mode, in which the pressing force to theflat washer 48 can be changed. - In this clutch mode, when the
motor 3 is driven to rotate thespindle 5, screwing or the like can be performed with the driver bit mounted on thedrill chuck 6. When screwing proceeds to a state in which a load on thespindle 5 exceeds the pressing force of thecoil spring 53 locking theinternal gear 17, theclutch cams internal gear 17 push thesteel balls flat washer 48 forward to allow theinternal gear 17 to idle, thereby ending screwing (clutch is operated). Here, as the driver bit is pressed toward a screw, thespindle 5 moves backward to allow thefirst cam 26 and thesecond cam 27 to be interlocked with each other. However, since thesecond cam 27 is freely rotatable, thesecond cam 27 rotates together with thefirst cam 26, and therefore percussion does not occur to thespindle 5. - Next, as shown in
Figs. 7A to 7C , in a second rotating position where the mode-change ring 39 is rotated by 30 degrees to the left from the position in the clutch mode, the camconcave portions 43 of thecam ring 41 are not yet positioned in front of thepercussion switching lever 36, and thepercussion switching lever 36 is still at the backward position. At this time, theflat washer 48 rotates as shown inFig. 7C to enable theinternal projections 50 to move to a position behind the protrudingstreaks 52 of the small-diameter unit 14 (a locked position). This leads to a drill mode, in which the forward movement of theflat washer 48 is always regulated by the protrudingstreaks 52 irrespective of the pressing force of thecoil spring 53. - When the
spindle 5 is rotated in this drill mode, thesteel balls clutch cams 55 of theinternal gear 17 irrespective of the load on thespindle 5. Therefore, theinternal gear 17 is still locked, and thespindle 5 continues to rotate. Here, also at this time, thesecond cam 27 is still freely rotatable, and therefore percussion does not occur to thespindle 5. - Then, as shown in
Figs. 8A to 8C , in a third rotating position where the mode-change ring 39 is further rotated by 30 degrees to the left from the position in the drill mode, the camconcave portions 43 of thecam ring 41 are positioned in front of thepercussion switching lever 36, allowing thepercussion switching lever 36 to move forward so as to connect theinner protrusion 37 to thesecond cam 27. On the other hand, interference in the axial direction between theinner protrusion 50 of theflat washer 48 and the protrudingstreaks 52 of the small-diameter unit 14 is not changed. This leads to a percussion mode, in which thefirst cam 26 and thesecond cam 27 are interlocked with each other at the backward position of thespindle 5. - When the
spindle 5 is rotated in this percussion mode, thespindle 5 is moved backward by pressing the drill bit or the like onto a material to be processed. Then, thefirst cam 26 rotating integrally with thespindle 5 interlocks with thesecond cam 27 which is locked by thepercussion switching lever 36, whereby percussion occurs to thespindle 5. Here, as theflat washer 48 is still locked by the protrudingstreaks 52, thespindle 5 continues to rotate irrespective of the load on thespindle 5. - A
leaf spring 56 is fixed to the inner circumference at the front end of thebody housing 2. On the other hand, as shown inFig. 5C andFig. 6 , threeconcave portions operation ring 40 in the mode-change ring 39. Theleaf spring 56 is engaged with each of theconcave portions 57 at a rotating position corresponding to the relevant mode. In this way, click operation can be achieved for positioning the mode-change ring 39 in the relevant mode. - As described above, according to the percussion driver drill 1 in the embodiment described above, the protruding
streaks 52 serve as the locking means for locking theflat washer 48. The protruding streaks are provided on the small-diameter unit 14 of thesecond gear case 12 to interfere with theflat washer 48 at a predetermined rotating position of the same to regulate its movement. By rotative operation of the mode-change ring 39, theflat washer 48 is rotated to a lock position where interference occurs with the protrudingstreaks 52 and to a lock-releasing position where interference does not occur with the protrudingstreaks 52. This allows either the clutch mode or the drill mode to be selected. Therefore, theflat washer 48 can be securely locked without being influenced by tolerances among the components. Due to this, erroneous clutch operation in the drill mode can be effectively prevented, and high reliability can be achieved. - Also, in the above embodiment, the mode-
change ring 39 has a third rotating position other than rotating positions in the clutch mode and the drill mode, where thesecond cam 27 is locked by thepercussion switching lever 36 and thefront washer 48 interferes with the protrudingstreaks 52. With this configuration, by rotative operation of the mode-change ring 39, the percussion mode can be selected for thespindle 5. Therefore, any one of three operation modes, that is, the clutch mode, drill mode, and the percussion mode, can be selected only with the rotative operation of the mode-change ring 39, whereby outstanding usability is achieved. - Furthermore, in the above embodiment, the
change ring 44 is provided for torque adjustment in the clutch mode, separately from the mode-change ring 39. Therefore, switching of the operation mode can be performed irrespective of the position where torque adjustment is performed by thechange ring 44. Still further, the operation mode is prevented from being erroneously switched at the time of torque adjustment. - Here, in the above embodiment, the protruding streaks are provided with the small-diameter unit in the axial direction of the second gear case in order to regulate the movement of the flat washer. Alternatively, another interfering unit, such as protruding streaks or pin-shaped protrusions provided in a circumferential direction, can regulate the movement of the flat washer. Also, the intermediate member is not restricted to the flat washer, but may be a cylindrical body. Furthermore, the engaging members are not restricted to the steel balls, and pins with their end being shaped like a cylinder or circle can be adopted.
- Still further, the above embodiment is described with a percussion driver drill in which a percussion mode is selectable. However, a locking means similar to that in the above embodiment can be adopted for a driver drill not having a cam means and a percussion mode. Also, the present invention can be applied to even a driver drill or a percussion driver drill in which operation-mode selection and torque adjustment can be performed only with a single operating member.
Claims (3)
- A driver drill including a housing (2) having a spindle (5) protruding forward, a motor (3) housed in the housing (2), a planetary gear reduction mechanism (15, 16) housed in a gear case (11, 12) of the housing (2) for transferring output of the motor (3) to the spindle (5) and allowing an internal gear (17) provided behind the spindle (5) to be rotatable, an engaging member held in the gear case (11, 12) for engaging with an end face of the internal gear (17), a pressing means (53) that presses the engaging member (54) from the front through an intermediate member (48) held movably in the axial direction by the gear case (11, 12), an interfering unit (52) for interfering with the intermediate member (48) to regulate movement of the intermediate member (48) in the axial direction, and an operating member (39, 44) for providing a lock position where interference of the intermediate member (48) occurs with the interfering unit (52) and to a lock-releasing position where no interference occurs with the interfering unit (52),
wherein at the the lock position a drill mode can be selected for regulating the movement of the intermediate member (48) and prohibiting the internal gear (17) from idling, and at the lock-releasing position a clutch mode can be selected for releasing the regulation of the movement of the intermediate member (48) and allowing the internal gear (17) to idle,
characterized in that
the interfering unit is provided in the gear case (11, 12) for interfering with the intermediate member (48) at a predetermined rotating position thereof; and
the operating member (39, 44) is capable of rotating the intermediate member (48) by rotative operation, wherein, by rotative operation of the operating member (39, 44), the intermediate member (48) is rotatable to the lock position and the lock-releasing position, respectively. - The driver drill according to claim 1, characterized in that the driver drill has a cam means (26, 27) that can add a percussion movement to an axial direction in conjunction with the spindle (5), wherein the operating member (39, 44) has a third rotating position other than rotating positions in the clutch mode and the drill mode, where the cam means (26, 27) is in conjunction with the spindle (5) and the intermediate member (48) interferes with the interfering unit (52), and by rotative operation of the operating member, a percussion mode in which percussion is transferred to the spindle (5) can be further selected.
- The driver drill according to claim 1 or 2, characterized in that a second operating member (39, 44) can adjust a pressing force of the pressing means (53) by rotative operation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004004610 | 2004-01-09 | ||
JP2004004610A JP4227028B2 (en) | 2004-01-09 | 2004-01-09 | Screwdriver drill |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1555091A2 EP1555091A2 (en) | 2005-07-20 |
EP1555091A3 EP1555091A3 (en) | 2007-01-31 |
EP1555091B1 true EP1555091B1 (en) | 2008-10-01 |
Family
ID=34616825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04027017A Active EP1555091B1 (en) | 2004-01-09 | 2004-11-12 | Driver drill |
Country Status (5)
Country | Link |
---|---|
US (1) | US7201235B2 (en) |
EP (1) | EP1555091B1 (en) |
JP (1) | JP4227028B2 (en) |
CN (1) | CN100500351C (en) |
DE (1) | DE602004016815D1 (en) |
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- 2004-11-09 US US10/984,039 patent/US7201235B2/en active Active
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Cited By (12)
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US7717192B2 (en) | 2007-11-21 | 2010-05-18 | Black & Decker Inc. | Multi-mode drill with mode collar |
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US7854274B2 (en) | 2007-11-21 | 2010-12-21 | Black & Decker Inc. | Multi-mode drill and transmission sub-assembly including a gear case cover supporting biasing |
US7987920B2 (en) | 2007-11-21 | 2011-08-02 | Black & Decker Inc. | Multi-mode drill with mode collar |
US8109343B2 (en) | 2007-11-21 | 2012-02-07 | Black & Decker Inc. | Multi-mode drill with mode collar |
US8555998B2 (en) | 2007-11-21 | 2013-10-15 | Black & Decker Inc. | Multi-mode drill with mode collar |
US9494200B2 (en) | 2013-03-14 | 2016-11-15 | Black & Decker Inc. | Clutch for power tool |
DE102013208895B4 (en) | 2013-05-14 | 2023-12-14 | Robert Bosch Gmbh | Hand tool device |
Also Published As
Publication number | Publication date |
---|---|
US7201235B2 (en) | 2007-04-10 |
CN100500351C (en) | 2009-06-17 |
EP1555091A2 (en) | 2005-07-20 |
EP1555091A3 (en) | 2007-01-31 |
JP4227028B2 (en) | 2009-02-18 |
JP2005193361A (en) | 2005-07-21 |
DE602004016815D1 (en) | 2008-11-13 |
CN1636658A (en) | 2005-07-13 |
US20050150669A1 (en) | 2005-07-14 |
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